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hankronIt's a nice enough photo and worth some coin, but it appears to have been printed after the 1901-2 date quoted. In part, the type of photographic paper shown wasn't manufactured until a later date (Different photo papers were made with different substances and chemicals, often giving them distinct visiable appearances that even a collector can identify).
If a collector holds a 1901 and, say, a 1925 paper photo side by side so the backs are showing, he will discover something both distinct and unexpected about the paper.